What absorbs at 1124 cm⁻¹ in an FTIR spectrum?
A band near 1124 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
A band near 1124 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| C-O single bond | 13 | 12 | 1.0 |
| Methoxy (OCH3) | 10 | 10 | 1.0 |
| Methacrylate | 10 | 10 | 1.0 |
| Acetate | 10 | 10 | 1.0 |
| Lignin | 3 | 3 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Nucleic acid | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| polysaccharide | 1124, 1637, 1320 | Methacrylate, Acetate, C-O single bond | 1 |
| nanoparticles | 1124, 1732, 1647 | C-O single bond, Methacrylate, Acetate | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 1124 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literature behind these assignments
-
Metal oxygen confidence 1.0
“In rGO-TiO2 400-700cm-1 nanocomposite a broad band around representing the stretching vibration of metal oxide bonding such as O-Ti-C and O-Ti-O 1124cm-1 is noticed [48] and the band is attributed to the direct”
Effect of co-sensitization in solar exfoliated TiO2 functionalized rGO photoanode for dye-sensitized solar cell applications DOI: 10.1016/j.mssp.2019.02.027 -
Metal oxygen confidence 1.0
“The peaks at 1124 and 428 cm-1 are the typical absorption peaks of the Zn-O bond,”
Kumar 等 - 2021 - Centella asiatica mediated facile green synthesis DOI: 10.1016/j.inoche.2021.108865 -
Secondary amine confidence 1.0
“(Barzagli et al., 2013, 2017) analyzed the possible mary amine -NH2 group in TEPA participates in the reaction, and the cm(cid:0) 1 reaction mechanism of CO2 with primary amine and secondary amine absorption peak at 1124 becomes very weak,”
Effect of H2O on absorption performance of tetraethylenepentamine-ethanol-CO2 two-phase absorbent and its mechanism DOI: 10.1016/j.ijggc.2021.103406 -
Acetate confidence 1.0
“An intense peak at 1124 may be attributed to the alcoholic C-O stretching vibrations.”
Synthesis of Aloevera/Acrylonitrile based Nanoparticles for targeted drug delivery of 5-Aminosalicylic acid DOI: 10.1016/j.ijbiomac.2017.08.085 -
Acetate confidence 1.0
“The high peak at 1124 cm-1 was caused by stretching the C-O-H secondary alcohol.”
Bio-Fabrication of ZnONPs from Alkalescent Nucleoside Antibiotic to Control Rice Blast: Impact on Pathogen (Magnaporthe grisea) and Host (Rice) DOI: 10.3390/ijms24032778 -
Phosphate (PO4) confidence 1.0
“The bands at 1124cm-1 in DPA are assigned to P=O and those at 999 and 937 to the P-O(H).”
The Effect of Hydrogen Bonding in Enhancing the Ionic Affinities of Immobilized Monoprotic Phosphate Ligands DOI: 10.3390/ma10080968 -
Acetate confidence 1.0
“IntheFTIRspectraofthecontrolandatypicalhyperplasiasamples,theabsenceofpeaksoriginating cm-1) from the stretching vibrations of C-O carbohydrates (1124 and deformation N-H cytosine cm-1) (1304 were noticed in comparison with the carcinoma sa”
Simultaneous FTIR and Raman Spectroscopy in Endometrial Atypical Hyperplasia and Cancer DOI: 10.3390/ijms21144828 -
C c single bond confidence 1.0
“1480-40 1435 Quinoid (>C-N=) stretching 1378 1336 Intermediate order (C- • N) stretching 1124 1121 CIO4 both the carboxylic C =0 and the aromatic C-C stretch375 ing vibrations are slightly red shifted upon deuteration, 376”
Benyoucef 等 - 2005 - Synthesis and in situ MRS characterization of cond DOI: 10.1016/j.eurpolymj.2004.10.047
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